browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
var agent = navigator.userAgent;

if (agent.indexOf("Opera") > -1) {
	document.writeln("<link rel=stylesheet type=text/css href=\"/common/css/ie4.css\">");
}
else if ((browserVer >3) && (browserName == "Microsoft Internet Explorer")) {
	document.writeln("<link rel=stylesheet type=text/css href=\"/common/css/ie4.css\">");
}
else if ((browserVer >3) &&(browserName == "Netscape")) {
	document.writeln("<link rel=stylesheet type=text/css href=\"/common/css/nn4.css\">");
}